Mr. Lee Iacoca - Famous Chrysler Chirman who was fired from Ford by Henry Ford for doing good: said to equip oneself with the knowledge and after that he ask to "DO SOME THING".
It is very difficult to start a businees when your comitments are more and the future become difficult to pull back to the earlier level in your forties. But it is profitable to start at ealier even when you loose finacial capital your experince always stand by you. If one succeeds then, sky is the only limit.